I tried a few variations on the Old Fashioned tonight.
The American Trilogy: equal parts bonded Applejack and rye (I used Rittenhouse), orange bitters. This cocktail was introduced to me by a friend. I read that it was created by Richard Boccato and Michael McIlroy from Little Branch in 2007.
Then I tried the same cocktail with Calvados instead of the applejack. It was not quite as good but I suspect that my Calvados is not quite up to par.
Then this cocktail on the Bittermens website caught my eye: The Conference (attributed to Brian Miller at Death and Company, 2007) with 1/2 oz each rye, bourbon, Calvados, Cognac, 1/4 oz demerara, Angostura and mole bitters, lemon and orange twists. It's a fun cocktail with a little bit of everything!